Improvement in bolts for safes



= iiinitmi tatee ',itatwt @titille JOHN FRREL, OF NEW YORK, N. Y;

Letters Patent N 102,793, dated May 10, 1870.

Mow- IMPROVEMENT IN BOLTS FOR SAFES.

'Ihe Schedule referred to in these Letters Patent aud making part. of the same.

safes and safe and vault-doors and locks, but particu lhe object of this invention Ais to make a bolt for safes that will successfully resist all attempts at removal by operating upon it from the outside.

To enable others' skilled in the art lto make and use' the invention, I will proceed to describe it.

In the drawing annexed- A rrepresents a conical bolt', used for lolding together the several layers of metal composing the exterior wall of a safe: 1, for example, representing wrought iron; 2, welded i'rou and steel; 3, Franklinite or spiegeleisen; and, 4, wrought iron or steel.

The bolt is inserted from the outside, and held in place by a nut, B, on the inner end, making it secure against removal, except by destroying the entire bolt by means of drills, chisels, or other sharp instruments.

'lo prevent thisfl combine with the metal or metals of which the bolt is made, such as wrought iron or steel, or both welded together, being more or-less ductile, another metal of anentirely different nature, heilig inductile, and, in its own normal condition, inherently hard and imperviable; said combination of the hard or induetile with the less hard and ductile metal being mechanical and effected by reducing the `hard metal to a melting heat, and then pouring the same around the other metal, or-into holes made therein lengthwise or transversely, as indicated at C inthe drawing, or in any other manner by which the combination ot' the two met-als may be mechanically effected.

The result is that, although the temper or hardness of the ductile meta-l may be drawn, as' by the use of the blow-pipe, no heat less than that of apfurna'ce can reduce the inherent hardness of the cast metal.

For the hard metal, I use white iron, Franklinite, spiegeleisen, or any other hard, indnctile, or cast metal requiring a white or melting heat to bring it into a working condition.

The invention is applicable to all bolts, shafts, rivets, spindles, or like parts employed in safes, and safe or vault-doors, or the locks' thereof, whether in the original construction 'or in their practical use.

I claim as my invention- The making of conicat and other bolts for safes and vaults, or the locks thereof, substantially as described,

for the purposes specified.

JOHN FARREL. Witnesses:

JOHN L. ROBERTS, Jr.,

S. H. Noires. 

